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Shouldn’t be, but air leak was a suspicion. Just no idea where!
I tightened down the new carb-engine gasket and it’s been running well compared to the leaky old one.
This issue seems to only be when coming to a stop from over 30mph and letting revs drop fast, typically pulling in clutch and coasting the last bit to save the engine from braking horribly in first or second.
When it does die, it needs the nudge with clutch and throttle, as button alone won’t do. Starting from warm with choke off (ie during journey after parking for a few minutes or more) it needs a flick of the throttle to get the revs to climb enough to start up.
In general use no bogging, hunting, or lack of power more than would be expected with an old 125. When warming up it will rise to over 3k on choke and sit there a while, and when it wants to drop, I go half choke and it sits a while longer. Gently close choke to get it sitting idle, too fast shutting off choke and again it will cut out.
Will give it a spray whilst idling warm tomorrow, last time I tried there were no boosts in revs.
Considering the mechanics had freed and re-set the timing screw to spec, I’d expect that they did so on the mixture screw too. Hmmmm. Maybe it’s just the spark plug again?
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pdlouche
MrE
Check the mixture screw is set right.
Any airleaks at the carb? Easiest way to check is as the bike is idling, spray brake cleaner around the area of the carb to head and see if the revs increase.